/**
* Returns a {@code TreeMap}, from a source java.util.Map.
*
* @param map A map entry.
* @param <K> The key type
* @param <V> The value type
* @return A new Map containing the given map
*/
public static <K extends Comparable<? super K>, V> TreeMap<K, V> ofAll(
java.util.Map<? extends K, ? extends V> map) {
Objects.requireNonNull(map, "map is null");
RedBlackTree<Tuple2<K, V>> result = RedBlackTree.empty();
for (java.util.Map.Entry<? extends K, ? extends V> entry : map.entrySet()) {
result = result.insert(Tuple.of(entry.getKey(), entry.getValue()));
}
return new TreeMap<>(result);
}
/**
* Creates a {@code TreeMap} of the given entries using the given key comparator.
*
* @param <K> The key type
* @param <V> The value type
* @param entries Map entries
* @param keyComparator A key comparator
* @return A new TreeMap containing the given entries.
*/
@SafeVarargs
public static <K, V> TreeMap<K, V> ofEntries(
Comparator<? super K> keyComparator,
java.util.Map.Entry<? extends K, ? extends V>... entries) {
Objects.requireNonNull(keyComparator, "keyComparator is null");
Objects.requireNonNull(entries, "entries is null");
RedBlackTree<Tuple2<K, V>> tree = RedBlackTree.empty(new EntryComparator<>(keyComparator));
for (java.util.Map.Entry<? extends K, ? extends V> entry : entries) {
tree = tree.insert(Tuple.of(entry.getKey(), entry.getValue()));
}
return tree.isEmpty() ? empty(keyComparator) : new TreeMap<>(tree);
}